期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 4, 期 3, 页码 944-951出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ee00457j
关键词
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资金
- National Science Foundation [CBET-0854223]
- Department of Energy Basic Energy Sciences [DE-FG02-05ER46255]
- Institute for Sustainability and Energy at Northwestern (ISEN)
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [854223] Funding Source: National Science Foundation
Reversible solid oxide cells (SOCs) are potentially useful for electrical energy storage due to their good storage scalability, but have not been seriously considered due to concerns over round-trip efficiency. Here we propose an SOC storage chemistry where the fuel cycles between H2O-CO2-rich and CH4-H-2-rich gases. The unique feature is the formation of CH4 during electrolysis, a less endothermic process than the usual H-2- or CO-forming reactions, enabling improved efficiency. Thermodynamic calculations and preliminary experiments show that the CH4-rich storage chemistry is produced during SOC operation at reduced temperature (similar to 600 degrees C) and/or increased pressure (similar to 10 atm). Balance of plant storage system requirements are discussed briefly.
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